514 LARID.E. 



some differences in tlieir habits, which will appear in their 

 histories. Those who have an opportunity of examining and 

 comparing the skeleton of our Manx Shearwater with that of 

 the Storm Petrel, cannot fail to observe internal distinctions 

 also ; that of the Manx Shearwater possessing the sternum, 

 and low keel of a swimming and diving-bird ; the Storm 

 Petrel, on the other hand, exhibiting the deep keel of a 

 Swift, and possessing accordingly enduring powers of flight. 

 These birds form M, Temminck's third section of the genus 

 Procellaria, which section has been advanced to generic dis- 

 tinction in the 4th Part of M. Temminck's Manual. The 

 term Thalassidrovia refers to the power and habit of this 

 group of running on the surface of the sea. 



The first published notice of Bulwer's Petrel that I am ac- 

 quainted with, is that by Sir William Jardine and Mr. Selby, 

 in the second volume of their " Illustrations of Ornithology," 

 already quoted. 



" We are indebted to the kindness of Mr. Bulwer, during 

 some years a resident in Madeira, for the subject of this 

 plate, which w^e consider as yet undescribed. It is not to 

 be found in the works of Latham or Shaw, or indeed in any 

 other which we have had an opportunity of consulting ; and, 

 from its marked characters, it is not a species that would be 

 easily overlooked. The length of our specimen is about ten 

 inches ; it inhabits Madeira, or the small islands adjacent." 



For its title to a place among our British Birds I refer to 

 Mr. Gould, Avho, in the 22nd, the concluding, part of his 

 Birds of Europe, gives a figure from a specimen obtained in 

 this country, with the following observations : — 



" On the authority of Colonel Dalton, of Slenningford, 

 near Ripon, we are enabled to add this rare species to the 

 Fauna of Britain, from a fine specimen which was found on 

 the banks of the Ure, near Tanfield, in Yorkshire, on the 

 8th of May, 1837 ; and which could not have been long 



